This reverts commit 8ffbf0d2.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=1158322

Original change's description:
> [TurboFan] Move SFI and BytecodeArray to kNeverSerialized
>
> This CL moves SharedFunctionInfo and BytecodeArray to the
> kNeverSerialized classes, making them directly accessible from the
> background thread.
>
> To resolve the dependence on HeapNumber and BigInt objects stored in
> the BytecodeArray's constant pool, this CL introduces a new
> ObjectDataKind::kPossiblyBackgroundSerializedHeapObject, which allows
> for objects to be serialized lazily from the background thread where
> we know that this is safe (e.g. because they are constant). BigInt and
> HeapNumber are the first members of this new group of objects.
>
> Bug: v8:7790
> Change-Id: I1d962d1cb7c36cc3f5baeb9603d5298f32af3363
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2567705
> Reviewed-by: Georg Neis (ooo until January 5) <neis@chromium.org>
> Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71716}

TBR=neis@chromium.org,nicohartmann@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:7790
Change-Id: Ice35d7c1c4d7e96be887a0aa26fbfa69db627022
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2589734Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71738}